Quantitative analysis method for oil-containing abundance of nuclear magnetic resonance rock in petroleum well drilling

Abstract

The invention relates to a fine well-drilling cuttings oil-abundance analysis method based on nuclear magnetic resonance technology. The method includes the following steps: debugging and calibrating a nuclear magnetic resonance analytical apparatus; making up a rock oil-abundance working curve at target horizon, getting rock cuttings at a reservoir layer without oil gas at the target horizon within the work area and preparing the rock cuttings into a sample mixture of crude oil and cuttings; soaking the sample mixture in water-soluble paramagnetic ion solution; conducting nuclear magnetic resonance analysis; with the intensity of nuclear magnetic resonance signals as the abscissa and the content of crude oil in the sample as the ordinate, drawing a rock oil-abundance working curve of the target horizon; and then calculating the rock oil-abundance data. The method can analyze well-drilling cuttings real-timely, work out the rock oil-abundance data real-timely and carry out quantitative evaluation to the oil-abundance of the reservoir layer, providing real-time technical support to oil exploration, development and production.

Description

1. Technical field [0001] The invention relates to a method for analyzing the oil abundance of rocks in oil drilling, in particular to an analysis method for the oil abundance of fine drilling cuttings by using nuclear magnetic resonance technology. 2. Background technology [0002] Oil and gas reservoirs are the basic units of oil and gas accumulation on the earth's crust. The research on geological conditions for oil and gas reservoir formation mainly includes oil source layers (source rocks), oil and gas generation, oil and gas migration, reservoirs, cap rocks, traps, and preservation conditions. Among them, the research on reservoir is the core content of oil and gas reservoir research, and oil abundance is an important parameter for evaluating reservoir properties and calculating oil resources. [0003] Oil abundance refers to the weight (or volume) of crude oil contained in rock per unit weight (or volume), and the percentage (weight% or volume%) is often used to expre...

AI Technical Summary

Problems solved by technology

There are two traditional methods for obtaining oil abundance in petroleum drilling geology: (1) Laboratory analysis method: this method collects drilling core samples for analysis, and can obtain more accurate oil abundance parameters, but due to the lack of core sections for drilling , so the obtained oil abundance parameters are also discontinuous and limited; in addition, due to the long cycle of laboratory analysis, it is difficult to meet the production needs

(2) Geophysical logging interpretation method: This method uses geophysical logging (such as acoustic waves, neutrons, density, resistivity, etc.) data and empirical formulas to obtain continuous oil abundance parameters. The interpretation and evaluation of reservoir properties are very helpful, but there are still many technical difficulties in this method when interpreting special oil and gas reservoirs, and this method can only be obtained after the completion of drilling (or mid-drilling) and geophysical logging

The meaning of the rock cuttings oil abundance parameter detected by this method is the percentage of fluorescence area, not the weight % or volume % oil abundance parameter in the true sense, and the measurement data is not accurate and reliable enough

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